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Java APIs to validate and request VOMS attribute certificates

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/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare, 2006-2014.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.italiangrid.voms.util;

import java.util.Calendar;
import java.util.Date;

/**
 * Time utilities.
 * 
 * @author cecco
 *
 */
public class TimeUtils {

  private TimeUtils() {

  }

  /**
   * Checks that a date falls in the interval allowing for a certain clock skew
   * expressed in minutes. The interval defined by (startDate, endDate) is
   * modified to be (startDate - skewInMinutes, endDate + skewInMinutes).
   * 
   * @param timeToCheck
   *          the time to be checked
   * @param startDate
   *          the start date of the time range
   * @param endDate
   *          the end date of the time range
   * @param skewInMinutes
   *          the clock skew in minutes to take into account
   * 
   * @throws IllegalArgumentException
   *           if passed an illegal time range
   * @return true, if the time is in the given range,
   *         false otherwise
   */
  public static boolean checkTimeInRangeWithSkew(Date timeToCheck,
    Date startDate, Date endDate, int skewInMinutes) {

    if (startDate.after(endDate) || startDate.equals(endDate)) {
      String msg = String
        .format(
          "Illegal time interval: start date must be before end date. [start date: %s, end date: %s]",
          startDate, endDate);
      throw new IllegalArgumentException(msg);
    }

    Calendar cal = Calendar.getInstance();
    cal.setTime(startDate);
    cal.add(Calendar.MINUTE, -skewInMinutes);

    Date skewedStartDate = cal.getTime();

    cal.clear();
    cal.setTime(endDate);
    cal.add(Calendar.MINUTE, skewInMinutes);

    Date skewedEndDate = cal.getTime();

    return skewedEndDate.after(timeToCheck)
      && skewedStartDate.before(timeToCheck);

  }

}